Ribbon mechanism for type-writing machines.



O. G. KAVLE.

RIBBON MECHANISM FOR TYPE WRITING MACHINES. \APPLIOATION FILED JULY 1. 1907;

944,734. Patented Dec, 28, 1909.

3 SHEETS-SHEET 1.

\ O. G. KAVLE.

RIBBON MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED JULY 1, 1907. 944,734. Patented Dec.28, 1909.

3 SHEETS-SHEET 2.

'Zv arnegs Z ve 55 7/5571 asses 0. C. KAVLE. RIBBON MECHANISM FOR TYPE WRITING MAOHINES.

APPLICATION FILED JULY 1. 1907.

. Patented Dec. 28, 1909;

3 SEEBTB-BHEET 3.

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nNITED STATES rigENT OFFICE.

OSCAR c. KAVLE, or SYRACUSE, NnwYoRK, ASSIGNOR -'ro HARVEY A. MOYER, or

SYRACUSE,

RIBBON MECHANISM FOR NEW YORK.

TYPE-WRITING MACHINES.

Application filed July 1,

v Specification of Letters Patent.

Patented Dec. 28, 1909.

1907. Serial No. 381,762.

To all whom alt may concern:

Syracuse, in the county of Onondaga and State of New York, have invented a new and useful Improvement in Ribbon Mechanistns for Type-Writing Machines, of which the following is a specification.

This invention relates more particularly to ribbon mechanisms for visible writing typewriting machines of the sort in which the ribbon is vibrated to and from the printing position opposite to the printing point on the platen, so as to expose the.

writing to view except when making the im press ons.

The inventlon is directed especially to ini provements in the mechanisms for feeding the ribbon lengthwise, reversing the direction of the feed thereof, and vibrating the ribbon, in a front-strike machine in which the impressions are made at the front side of the platen. Many features of the invention are, however, also applicable to other kinds of typewriting machines.

The objects of the invention are to provide simple, compact and di'rectacting driving means'for Winding the ribbon onits spools; also to provide easily operated and positively acting means of simple construc tion for' reversing the feed of the ribbon;

2 also to provide slmple means for vibrating the ribbon, and for disconnecting it from its vibrating means so that it can remain idle out of printing position to adapt the machine for stencil cutting; also to provide a vibrator adapted to gulde two ribbons and vibrate-them together, and operating means therefor whereby the vibrator can be moveddifferent distances from the same normal position as required to vibrate one or the other ribbon to and from the printing posi- .tion; also 'to so construct the vibrating scribed and set forth in the claims.

In the-accompanying drawings, consist- I mechanism that it will produce likevibration of the ribbons in either position of the platen, in a machine in which theplatenis shifted to different positions for printing upper and lowercase characters; and also to improve r bbon mechanisms for typewriti-ng machines 111 the res ects hereinafter deing of three sheets: Figure 1 is a longitudinal sectional elevation of portions of a front strike typewriting machine provided with Fig. 2 is a broken plan view thereof, partly in horizontal section, inline 22, Fig. 1.. Fig. 3 is a transverse sectional elevation thereof. Fig. 4 is a transverse sectional ele- 4l'4, Fig. 1. Fig.5 is a plan view detached of the ribbon reversing cam wheel. Fig. 6 is a plan view, partly in section, of one end of one of the feed levers and the pawl lever operated thereby. Fig. 7 is a transverse sectional elevation of the ribbon vibrating mechanism in line 77, Fi 1. Fig. 8 is a rear elevation of the partially formed vibrating ribbon guide.

Like letters of reference refer to like parts in the severalfigures.

A represents the main frame of the machine, the topplate a ofwhich preferably has an elevated front portion provided at opposite sides with spool seats a and with a central opening to allow the typebars to strikethe platen. V

B represents the platen; C the platen carriage; C the usual spring drum or motor on which the carriage is supported and travels transversely of the machine; B one .of the type-bars which are suitably pivoted to strike. the front side of theplaten; and -E- one of the key levers for operating the type-bars. The type-bars are provided with upper and lower case type, and the shift frame D is suitably pivoted at the upper rear 'ortionof the main frame to swing up and own about an axis, indicated at d, Fig. 1, to place the platen in printing relation with either set of type on the type-bars. The shift frame is shifted and held insuch positions by an oscillatory eccentric f and rod f connected to the same andhaving a slotted central extension f of the shift frame.

. tion and are thus briefly described simply to istruction shown struction. G G represent two link ribbons carrying inksdifi'eringdn color or other characteristics, As shown, they are arranged edge to edge, one over the other,'are connected at or any other suitable conor forked upper end connected to a front.

Thesepa-rts constitute no part of the invenribbon mechanism embodying the inventions -vation of the ribbon feed mechanism in line for driving the carriage; D the shiftframe aid inapr'oper understanding of the ribbon I mechanism. They may be of the'known con opposite ends to a single 'pair of spools H H and pass one over the other through a guide or vibrator in front of or opposite, to the printing point of the platen. The .rib'bons are wound on the spools and vibrated together in the same manner as 'a-singleribbon.

would be. In fact, one'wide ribbon having upper and lower bands of different kinds of ink would be operated in just the samemam ner, and for simplicity the feeding and reversing mechanisms, will be described as though only one ribbon were used. The .spools' are located in the .seats ,a in the top I plate a and -are suitably secured-to the up erends'ofupright spool shafts h h journa ed insuitable bearings depending from the top plate.

, V The mechanism for driving the spools to V feed the ribbon lengthwise and for reversing the feed is; similar in principle to that disclosed in-Iny application filed Sept.4, 1906,

Serial' No. 333,216, but is preferably'of the following improved construction: v

I I represent two feed levers which are arranged horizontally beneath the top plate a and are suitably fulcrumed between their ends, for instance, on pivots 1; depending the spool shafts ]z," ,h, and carrying feed pawls kpressedI-byhidden.springsinto engagement withjratchet wheels 70 fixed to the spool shafts. The toothedsegments -z' '1? engage their pawl carriers respectively front and in rear of the spool shafts h h, so

. back and the driving drum turned in'the rethat by rocking the feed'levers in thesame direction the pawl carriers and feed pawls I will be oscillated in opposite directions:

k -represents holding dogs which'are suitably pivoted tothe top plateand are pressed by hidden springs toward the ratchet wheels to hold the wheels from backward rotation. .L, Figs. 2 and 4, represents a horizontal rack'bar which meshes with. a. pinion Z se'-.

cured to or driven by the carriage driving druni O. The rack bar is attached to a slide Z which is guided in a slot 1 in the top. late and is connected to the rearends of the eed Levers la is by links Z Zpivoted to said slide and to the levers. When the spring drum turns'slowly in one direction in moving the carriage to the left under/ the control'of its escapement, the feed levers are slowly rocked in one direction and advance the feed pawls, and whenthe carriage is set verse direction, the feed levers and pawls are returned. One ofthe pawlsis held by its" spring against its ratchet wheel to turn the same and the connected s 001 shaft and spool, but the other feed aw is held'out of engagement with its ratc let wheel by one of 3 and I nected to .movetogether by a rod or bar N 0, Figs. 2,3.and5, represents a cam two like,-but oppositely arranged reversing levers M M, Figs. 1-3. Each of these'levers is arranged horizontally above one of the ratchet Wheels, being fulcrumed between-its ends by a hub or sleeve-on a pivot m depend ing from-thetop plate, or in any other suit levers have able manner. The reversing shafts, each loops surrounding the -spoo loop having at one side a segmental circular edge for engagingthea'djacent feed-pawl, and at the opposite side 2. lug 'm for engag-- ing the "tail 0 the-adjacent holding dog.

In the position of the reversing levers shown .in Fig.' 2,;thecircular edge of the l'ever-;M at the left engages the adjacent feed 'pawllc and holds it'a'way from its ratchet1wheel,'and thelug'm' on this lever also holds the dog k away fromthe ratchet wheel, thus leaving this wheel-free, while the ri 'ht-hand reversing lever Mpermits both ti will be turned'bythe forward movements of the feed pawl. In this, position'ofthe re-' versing levers, therefore-.2 .theright-hand turned to wind the ribbon onthe spool, and

e adjacent feed pawl and dog toengage. their ratch t wheel so that this wheelratchet wheel and connected spool :are

the other ratchet wheel and connected spool.

are released so thatthe spool can turn' freely as the IibbOIl is unwound therefrom.

To reverse the direction of feed of. the rib-' bon the reversing levers are shifted to the hand ratchet wheel will be rendered inactive and those for the left-hand wheel will come 'position -indicated by'dotted lines Fig. 2, when the feed pawl and dogfor the right-- into action. The mechanism for thusshift-.

ing the reversing levers to. reverse the direction of feed. of the ribbon is preferably constructed as follows, see especially "Flgs. 2,

5: The' two' reversing levers are conarranged horizontally transversely. of the machine beneath the front edg of the to plate a and-connectedtoforvirardly extend ing arms of' thefreversing levers.

wheel which is mounted torevolve on the bearing forthe -left-hand spool shaft, andis' provided with a series of salient peripheral portions or projections separated by intervening depressions and having seats or notches adjacent reversin lever-bears against. the edge of thecam w eel. A suitable spring as 79, Fig. 2, attached to-the connecting rod N and a pindepending from the top plate,

tends to move said rod toth'e left and the.

looped'endsof the reversing levers to the right, thus pressing the pin p against the edge of the cam wheel 0. A ratchetwheelin their peaks. A stud orpin p fixed to the p is secured to the hubof the cam wheel t and is provided with-teeth equal in number to the number of the peripheral projections and depressions of the cam-wheel, for instance, the ratchet wheel shownhaseight teeth and-the cam wheel has four projections and four depressions.

Q, Figs. 1,2 and 3, represents a push rod which is arranged horizontally to slide forwardly and rearwardly adjacent to the ratchet wheel. As shown, the push rod is guidedat its front end in a hole in the main framepand at its rear end between lugs q extending from the side of the/main frame and connected by a screw g which prevents a pin or displacement of the push rod. The rod is held from turning by fiat upper and lower faees at its rear end bearing. against 'the guide lugs. Shoulders at the inner ends of said flatjfaces and a pin 9 in the end of therod are adapted to strike the guide lugsto limit the rearward and forward movements of the push rod. A, pawl or dog 9 is pivoted betweenlts ends in a slot in the push rod irith its front end bearing against a shoulder on jthe push rod, audits laterally extending ifearend-arranged to engage the teeth of the ratchet wheel; The dog -is held in this normal position and the push rod held in theforward position shown by a spring q attached to .the rearend of the pawl and to part on the top plate. When the push rod is shoved rearwardly the dog engages one ofthe teeth of the ratchet wheel,

turning it and the connected cam wheel a part revolution. If the arts are in the position'shown in Fig. 2 thls will disengage the seat of one projection of the cam wheel from the in p on the reversing lever and the "pin p Wlll be .causedto slide-inwardly on the edge of the cam wheel into the next depression of the cam-wheel by the spring pf attached to the connecting rod N, thus allowing the looped ends of the reversing levers to move to the right until arrested by the- -engagement of the pin in the bottom depression of. the cam wheel. The spring 9? attached to thereversin'g dog Q wi retract the push rod when the pressure thereon is removed. At the next rearward movement of the push rod the dog will engage the next tooth of theratchet wheel and turn it and the cain wheel another step,- and the cam edge of the next projection of the cam wheelwill engage the pin ;0 on the reversing lever and force the looped ends of the reversing levers to the left until the pin seats in the feeding. The

particular construction ing point of the platen,

any suitable construction,

of the 1 Thus the reversing levers canthe direction-in which the ribbon may be ribbon can be reversed at any desired time. easily operated, is positive 1n action and holds the reversing levers stationary in both of their positions. 1

The invention is not. restricted to the and arrangement of the parts of'the reversing'mechamsm above described, so long as the essential features of the cam wheel and means for turning it successive part revolutions by successive likemovements of the same partare'retained,

The construction and arrangement of the reversing levers and feed levers and their operating means could al 0 be modified, for instance, as disclosed in n y said tip lication, without affecting the operation of the reversing mechanism, and the operation of the feed and reversing mechanism is not depend entupon the number or arrangement of the ribbons employed. The ribbon vibratin imechanism is preferably constructed .as follows: R represents "the ribbon guide or vibrator which normally stands in the front of and below the printand is mounted to- The reversing mechanism is vibrate up and down. The guide can be of but is preferably made from sheet metal bent into the shape shown. In Fig. 8 the guide is shown as partially formed, the left-hand side showmg the shape of This blank is slotted at its upper portion to enable the type-bars to engage the ribbon,

ends small extensions 1, and centrally 'bethe blank before bending.

tween these a T-shaped projection r. The I central projection r is bent to the rear and i the up er. and .lower extensions 9' are bentre'spectively downwardly and upwardly to the rear, as shown at the right-hand side of the guide in Fig. 8, thus providing two ribbon guide'openings each with a central slot. fdrthe insertion and removal of the,

or vibrator slides vertically in suitable ways on the rear side'of an upright support 1* which is attached'by rearwardly-projecting feetto the frontextension f of the. shift frame, see Fi s. 1 and 2. The vibrator sup ribbon. In the machine illustrated the guide port isslotte atits upper end fo'r the pas.

sage of the type to the platen and is provided with a central opening 1-? through which and the slot in the vibratorcan be. "seen the scale bar, which is located in rearof the guide. v

S represents a lever for vibrating the guide or vibrator. This lever is fulcrumed on the rear side of the shift frame extension 2 and extendsforwardly from its fulcrum, having'at its frontend a pin or stud s, Fig. 1, engaging ina hole 8 in the lower portion. of the guide pr vibrator. The guide or vilOl) and is provided with lateral wings or portions eachhaving at its upper and lowerln'ator is preferably made of spring metal and its lower end is bent forwardly to form a finger picce.- By springing the lower end forwardly and pulling-the guide or vibrator downwardly, the stud of the-vibrator lever can be disen aged from the-hole s and engaged in a s t 8 in" the guide or vibrator, which is long enough to permit the vibrator lever to oscillate without vibrating the guide. Thus the guide or vibrator can be readily placed out of action with the ribbon below the printing point when it is desired to use the machine for stencil cutting.-

1 When it is desired toagain place the vibra tor in action, it is only necessary to shove the guide or-vibrator upwardl in its supportand engage the hole s. in .1ts lower end over the stud of .the vibrator lever. This 'ccnstructipn enables the vibrator to be readily placedeither into or out of use without complicating the vibrating means with ad'- ditional arts for this purpose.

The vi rator lever is .preferably pivoted at its I'GtlP'Q-Ild to the lower end of the link 17 which is pivoted at its upper end to an arm or lever t fixed to a rocking universal bar or shaft T arranged horizontally transversely of themachinein rear of the vibrator lever.

This universal bar. is rocked by one or more actuators t Fig. l,"arranged tofbe struck "by the type-bars as they approach the platen and. to strike an arm or arms t depending from the rock'shaft T. The vibrator lever .S moves'up and downwith the shift frame in'shift'ingthe platen, and the link is so arranged that a straight linepassing throu l1 1 .the pivotal axis of the shift frame, and t e pivot connecting said link with the operating lever 25, will extend midway between the positions occupied by the link in the upper and lower positionsofthe shift frame, thus causing substantiall like movements of the vibrator in both ppsltions of the shift frame.

' This universal bar, which actuates the carriage escapement, forms the subject matter of myzapplication, Serial No. 378,089, filed '-J'u ne-10, 1907 and is only shown herein and thus briefly'described as one means for operating the ribbon guide-or vibrator. Any other actuating meansfor. this purpose could be employed. a Y

The vibrator is operated to move from the same normal position below the printing point-for vibrating the ribbons regardless of which ribbon is in use, and as one ribbon is located above the other, a shorter movement of the vibrator is required to vibrate the upper ribbon, which is the one more frequently used, than is necessary .to vibrate the lower ribbon. These different movements of the guide or vibrator are accomplished without changing the normal position of the vibrator lever by. shifting its fulcrum point relative to the operating link in the followng manner: The fulcrum arm of the lever U, andfulcrum. pins or pivots a and 14 ex- 7 tend inwardly from these legs into the holes in the lug. The engagement of the pivots in the holes in the lug holds the yoke steady on the lug. WVhen the yoke is moved to-the right, as shown in Figs. 2 and 7, the lefthand pivot u extends through one fulcrum hole ofthe'vibrator lever and bears in the lug at opposite sides of the lever, whilev the other pivot' u? is withdrawn from its hole in thefjvibrator lever. The lever is then free toswing on the pivot n as a fulcrum. By shoving the yoke tothe left, the pivot 10 I is withdrawn from its hole in the lever, and theother pivot a is-engaged in its hole in the lever and bears at opposite sides of the lever in the lug U and the lever can then swingon this pivot as a fulcrum. In shift-- ing the yoke onepin enters its hole in the lever before the other pivot is withdrawn from its. hole, tlierebypreventing the dis-. placement of the vibrator lever. Thus by shifting the yoke the lever, without being itself'shifted or moved from its normal position, has its fulcrum point shifted farther from or nearer to the point-of attachment of the operating link wlth the lever and thus the throw of the vibrator lever is shortened or lengthened accordingly.

' .In the normal operation of the machine,

when the upper ribbon is used the vibrator lever swings on the pivot a and when it is I desired to--use the lower ribbon the yoke 1s shifted and the vibrator lever swin s on the other pivot u. As shown, the yolze is attached to ahorizontal rod or shaft V which slides in guide'holes in lugs '22 on the underside of-the shift frame, one end of the rodextending to the side of the machine, see Fig. 7, where it canbe grasped and operated to shiftthe yoke. Any other suitable nenns might be employed for shifting the yoke.

. The ribbon vibrating mechanism described is not dependent upon the arrangement of the ribbons or the feeding and reversing mechanism therefor. The vibrator would operate in the same manner whether the ribbons are wound sideby side or one over the other on a single pair of spools or each llbf bon on separate spools. I

I claim as my invention 2 1; In a typewrit-ing machine, a ribbon vi- 7 brator having integral side portions thereof bent inwardly and integral upper and lowerportions thereof bent.tow ard. said inwardly ent side-portions to. form separate guides for two ribbons, 'with separate openings therein to permit the insertion and removal of the ribbons, substantially as set forth.

2. In a typewriting machine, the combi-.

lever pivot and having an arm projecting 'upwardly and forwardly, and a link piv-- otally connected to said lever arm and to the vibrating lever, substantially as set forth.

4-. In a typewriting machine, the combination of a carriage shift frame pivoted at its rear portion, a vibrating ribbon guide supported by the shift frame, a vibrating lever connected at its front end to the ribbon guide and pivoted at its rear portion to the shift frame, an operating lever fulcrumed in rear of said lever, and a link pivoted to said arm and to said lever, the link being arranged to swing across a straight line passing through the pivotal axis of said shift frame and the pivotal connection between the link and said operating lever whensaid shift frame is shifted, substantially as set forth.

5. Ina typewriting machine, the combination of a carriage shift frame, a ribbon.

guide, a lever for vibrating said guide pivoted on said shift frame, 'and operating connections for said vibrating lever including a link which extends from said vibrating lever in a direction substantially toward the pivotal axis. of saidshift frame whereby the movements of said .vibrator lever are substantially the same in difierent positions of said shift frame, substantially as set forth.

' 6. In a typewriting machine, the combination of a ribbon vibrating lever, two ful- .crums for said lever, and means for moving said. fulcrums together to place one in sup porting engagement with said lever and disengage the other from the lever, said ful crums being so arranged relative -to each other that one will engage the leverbefore the other .disengages the lever, whereby the.

lever will always be supported by one of the fulcrums, substantially as set forth.

7. In a typewriting machine, the combination of a ribbon vibrating lever having two fulcrum openings, two fulcrums vmovable in-the direction of their. length "and adapted to enter the openings of the lever from opposite directions, the fulcrums being so arranged relative to each other thatone will enter its opening in the lever before the other leaves its opening, whereby the lever will always be supported by one of the fulcrums, substantially as set forth.

' 8.- In a typewriting machine, the combi-' nation of acarriage'shift frame, a ribbon *guide, a vibrating lever for the same, a part which is supported by'said shift frame and has two fulcrums for supporting said lever and which is movable to engage one fulcrum with and disengage the other fulcrum from said lever, and means for operating said vibrating lever, substantially as set forth.

9. Ina typewriting machine, the combination of a carriage shift frame, a ribbon guide and vibrating lever for the same both supported by and moving with said shift frame, a movable supporting part for said lever whichis carried by said shift frame and has two fulcrums for said lever and is movable to engage one fulcrum with and disengage the other fulcrum fromsaid lever, and means for operating said vibrating lever, substantially asset forth.

.10. In a typewritingmachine, the combination of aplaten, a shift frame for shifting the platen to different printing positions, a ribbon vibrator which shifts with said platen, a guide for said vibrator which is arranged to shift with said shift frame,-

means forvibrating said vibrator at the type strokes, and means which are supported by said shift frame and are movable for changing the throw of the vibrator, substantially as set forth.

' 11. In a typewriting machine, the combination of a carriage shift frame, a ribbon vibrator supported thereby, a vibrator lever fulcrumed on the shift frame and connected to the vibrator, means for shifting the fulcrum point of the vibrator lever to different positions relative to said lever to change the throw of the-vibrator, a main frame supporting the shift frame, operating means for said vibrator leversupported. by the main" frame, and connections between said operating means and the vibrator lever whereby the lever may vibrate about different fulcrum points in difierent positions of the shift frame, substantially as set forth.

12. In a typewriting machine, the combination of a power-driven reciprocating rack, a pair of horizontal centrally pivoted ribbon .feed levers, separate connecting rods pivoted to said rack and to the, rear ends of said levers, and ribbon spools opgrativel'y con nected to the frontends of sa1d feed levers, substantially as set forth.

13. In a typewriting machine, the combination of a power-driven carriage, a pinion driven by the carriage .drlving powerya.

rack meshingwith the pinion, aipair of ribbon s ools, a pair of centrally pivoted horizonta levers 'operatively'* connected to the spools at their front ends, and connecting vmeans for simultaneously swinging said reversing' levers, substantially as set forth.

15. In a typewriting machine, the combination of a motor, a pair of spool shafts, a pair of feed-levers oscillated together in the same direction by said motor, ratchet and pawl connections between said levers-and said spool shafts, a pair of reversing levers having curved faces for holding said pawls out of engagement with said ratchets, and means for swinging one of said reversing levers into position to engage the pawl controlled thereby and the other lever into position to release the awl controlled thereby, substantially as set orth.-

1 6. In a typewriting machine, the combi-- natlon of a pair of upright spool shafts, a

pair of ratchet wheels secured tosaid shafts, a pair offeed pawls, means for constantly reciprocatingsaid feed pawls, a pair of hori-.

zontal reversing levers plvotallymounted in front of the spool'shafts for forcing the pawls out of contact withtheir ratchets, and

a reciprocating rod at the frontportion ofthe machine connecting the levers for swinging them on thelr pivots simultaneously to release one pawl and force the other pawl out of contact with its ratchet wheel, substantiallyas set forth;

17 In a typewriting machine, the combination of ribbon spools, driving devices therefor, connectionsbetween. the driving device for one spool and that for the other spool, aspring acting in one directionon said connections, and a cam acting to hold said connections in either of two positions against the action of the spring, substantiallyas-set forth.

' 18. Ina typewriting machine,the combination of ribbon spools, driving devices.

therefor, connections between -the driving device for one spool and that for theother spool, acam controlling the position of said' connections, and means' acting when'movedin the same way .to move said cam to alternately cause opposite move ents of said connections forrendering one riving device as set forth.

active and'the other inactive,substantially 19. In a typewriting machine, the combi-' nation of ribbon spools, driving devices therefor, connections between the driving device for one spool and that for the other spool, a spring acting on said connections in one direction, a cam acting to limit the movement of the connectmnsm one direc-.

- tion and toforce said connections in another direction, and means actingwhen moved in the same way to move the cam to alternately cause opposite movements of said connections, substantially asset forth.-

20. In a typewriting machine,the combination' of ribbon spools, driving devices therefor, connections from the driving de-' viceof one spoolto. that of the other spool,

a rotatable cam acting on said connections to reverse the feed oft-he ribbon with every movement .of the cam, and a .partacting with every movement in the same direction to turn saidcam from one reverse position to the other, substantially asset forth. 21. In typewriting machine, the combination of ribbon spools, driving devices therefor, connections, from the driving device of onespoOl. to that of the other spool, a rotatable cam acting on said connections toreverse the feed of the ribbon, a ratchet wheel connected to the'cam, and a pawl acting with every movement from normal position on said ratchet wheel to move the cam from one reverse position tothe other, sub-- stantially as set forth.

a '22. Ina typewriting machine, the combination .of a pair of ri-bbon'spools,-driving means therefor, a pair of levers for rendering said driving meansactive on one spooland inactive onjthe other spool, means to .cause said lovers to move together, a spring acting in one direction on said levers, a pin orprojection on one of said levers, a rotatable cam having aseries of rests for said pin arranged alternately at different distancesfrom the axis of the cam, and means for-intermittently turning said cam, substantially asset forth.

23. In a typewriting machine, the combination of a pair of ribbon spools, driving means therefor, spring-operated means for rendering said driving means active on one spool and inactive on the other spool,.a rotatable; cam concentric with one. spool shaft and having'a series of" dam surfaces that control the position of said spring-operating means to reverse the feed ofthe ribbon, and a manually movable partlacting to turn said cam a part revolution with its every work{ ing movement, substantially as set forth.

24. In a typewritingm'achinathe combination of a pair of spools, driving means therefor, connectlons for rendermg the driving means active on one spool and mactlveon the, other spool, a ratchet wheel, a cam connected theretoand arranged-in working contact with said connections, a push rod supporting a pawl to' act on the ratchet wheel, and a springacting to yieldingly hold the pawl in contact'with the ratchet andto' restore said pawl and sad feed rod totheir normal positions, subs't tially'asi'set forth.-

on the shift frame,

25. In a typewriting machine, the combination with a platen.- and a carriage for the platen, of a shift frame which forms the entire support for the carriage and is movable to'shift the platen to di 'erent pr-intin positions, a ribbon vibrator/lever mounted and meansfor vibrating the lever the same distance with the carriage I and shift frame in both the normal and shift- .ed; positions, substantially asset forth.

. 26. In a. typewriting machine,fthe com bination with a platen .and a. carriage for the platen, of a shift frame which forms the sole support for the carriage and ismovable,

to. shift the. platen to different-printing positions, a ribbon vibrator lever pivotally connected to the shift frame, key-actuated means for vibrating the lever the same distance at each printingoperation with the platen-inf both the normal andshifted-positions, and means for changing the throw of the lever,

substan tially as set forth.

27. In a typewritingmachine, the combination of a platen, a carriage for the platen,

a frame for shifting the carriage to place the Iplaten in different printing positions, a ribon vlbrator which shifts with the carriage, a guide for said vibrator supported by the shift frame, means for vibrating the vibrator at the type strokes, and means movable independently of said vibrator for changing the throw thereof, substantially as set forth.

28. In a typewriting machine, the combination ofa platen, a shift frame for shifting the platen to different printing posi-f tions, a ribbon vibrator andmeans for supporting, guidin all su ported shift rame, an

and s'hiftable with said means also supported by said shift frame which are movable 1nde-- and vibrating said vibrator pendently of said vibrator into different relations to said vibrator for changing the throw thereof, substantiallyas set forth.

29. In a typewriting machine, the com- 'bination with a platen-and a carriage for the platen, of a shift frame which forms the entire support for the carriage and is mov: ableto shift the platen to different rinting CHESTER W. REID, O'r'ro A. Sammy.

the throw of the lever; substanshifts 

